George i don't see the similarities with this code: void outwiegbit(unsigned int b) { int sel = b == 0 ? W_D0 : W_D1; digitalWrite(sel, 0); delayMicroseconds(80); digitalWrite(sel, 1); delayMicroseconds(240); } You wiggle one or the other. This wiggles both at the same time. See what think. Tom

Goerge, Oops, I read through that too quickly. Here is another try an transmitting: https://www.codeproject.com/Articles/1250921/Wieganduino-Generate-Wiegand-Codes-with-Arduino I thought it would be necessary to invert the second line from the first. This shows how to wiggle each line in code. Tom M...

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